The tool tip for Aman and Human passive skill, their racial traits, are swapped.
The Human racial passive skill, "Indomitable Spirit", says that Humans receive 10 less damage when their hp is below 30%. First of all, it's a 10% reduction, not flat 10. And second, this reduction only affects PVP damage.
The Aman racial passive skill, "No Stranger to Pain", says that Amani receive 10% less PVP damage when their hp is below 30%. This one is also wrong, the 10% reduction only affects PVE damage.
This is only a tool tip or skill description bug. The racial skills work as intended, (Just tested it and when low health Aman received 10% less pve damage, Human did no. Didn't test pvp damage tough), but their tool tips are wrong. This seems to be a recent bug because I remember reading that Amani have the PVE one, and Humans the PVP one. The Tera wikia agrees with me.
This bug happens both when reading your skills in the skills menu in game, 'K' by default. And also when creating a new character.
Just to clarify. Amani = PVE reduction. Humans = PVP reduction. Fix the tool tips.